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A circular loop has radius R and a curre...

A circular loop has radius R and a current I flows through it. Another circular loop has radius 2R and a current 2I flows through it. Ratio of the magnetic fields at their centres is

A

`(1)/(4)`

B

1

C

2

D

4

Text Solution

Verified by Experts

The correct Answer is:
A
`B_(1) = (mu_(0) I)/(2R) and B_(2) = (mu (2I))/(2 (2R)) , (B_(1))/(B_(2))` = 1
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